Bug 1750351 - Include push tasks for sp-perftests to prevent reschedu…

…ling builds. r=aryx DONTBUILD

This patch sets the include-push-tasks field to true for the perftest cron. This will prevent it from scheduling additional builds when those builds already exist in the push.

Differential Revision: https://phabricator.services.mozilla.com/D190032

.cron.yml

@@ -385,6 +385,7 @@ jobs:
           type: decision-task
           treeherder-symbol: sp-perftests
           target-tasks-method: sp-perftests
+          include-push-tasks: true
       run-on-projects:
           - mozilla-central
       when: